#include <iostream>
#include <cmath>

int main() {
    int N, M, K;
    std::cin >> N >> M >> K;

    double remaining = static_cast<double>(N);
    double rate = 1 - static_cast<double>(K) / 100;
    int years = 0;

    while (remaining >= M) {
        remaining *= rate;
        years++;
    }

    std::cout << years << std::endl;

    return 0;
}